[clang-tools-extra] [compiler-rt] [libc] [lldb] [llvm] [libcxx] [clang] [flang] [libc++][variant] P2637R3: Member `visit` (`std::variant`) (PR #76447)
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Fri Dec 29 22:27:46 PST 2023
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<details>
<summary>
You can test this locally with the following command:
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``````````bash
git-clang-format --diff 886655869cef2e0f11da8981da30d70ad7892ff9 4d3ff8bd92f92404db1d1dd56e8ff4a5b5226dbb -- libcxx/test/std/utilities/variant/variant.visit/member.visit.pass.cpp libcxx/test/std/utilities/variant/variant.visit/member.visit.robust_against_adl.pass.cpp libcxx/test/std/utilities/variant/variant.visit/member.visit_return_type.pass.cpp libcxx/include/variant libcxx/test/std/utilities/variant/variant.visit/visit.return_type.pass.cpp libcxx/test/std/utilities/variant/variant.visit/visit.robust_against_adl.pass.cpp
``````````
</details>
<details>
<summary>
View the diff from clang-format here.
</summary>
``````````diff
diff --git a/libcxx/test/std/utilities/variant/variant.visit/visit.return_type.pass.cpp b/libcxx/test/std/utilities/variant/variant.visit/visit.return_type.pass.cpp
index eb425c07f9..246b01a68f 100644
--- a/libcxx/test/std/utilities/variant/variant.visit/visit.return_type.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.visit/visit.return_type.pass.cpp
@@ -26,7 +26,7 @@ template <typename ReturnType>
void test_call_operator_forwarding() {
using Fn = ForwardingCallObject;
Fn obj{};
- const Fn &cobj = obj;
+ const Fn& cobj = obj;
{ // test call operator forwarding - no variant
std::visit<ReturnType>(obj);
assert(Fn::check_call<>(CT_NonConst | CT_LValue));
@@ -41,63 +41,63 @@ void test_call_operator_forwarding() {
using V = std::variant<int>;
V v(42);
std::visit<ReturnType>(obj, v);
- assert(Fn::check_call<int &>(CT_NonConst | CT_LValue));
+ assert(Fn::check_call<int&>(CT_NonConst | CT_LValue));
std::visit<ReturnType>(cobj, v);
- assert(Fn::check_call<int &>(CT_Const | CT_LValue));
+ assert(Fn::check_call<int&>(CT_Const | CT_LValue));
std::visit<ReturnType>(std::move(obj), v);
- assert(Fn::check_call<int &>(CT_NonConst | CT_RValue));
+ assert(Fn::check_call<int&>(CT_NonConst | CT_RValue));
std::visit<ReturnType>(std::move(cobj), v);
- assert(Fn::check_call<int &>(CT_Const | CT_RValue));
+ assert(Fn::check_call<int&>(CT_Const | CT_RValue));
}
{ // test call operator forwarding - single variant, multi arg
using V = std::variant<int, long, double>;
V v(42l);
std::visit<ReturnType>(obj, v);
- assert(Fn::check_call<long &>(CT_NonConst | CT_LValue));
+ assert(Fn::check_call<long&>(CT_NonConst | CT_LValue));
std::visit<ReturnType>(cobj, v);
- assert(Fn::check_call<long &>(CT_Const | CT_LValue));
+ assert(Fn::check_call<long&>(CT_Const | CT_LValue));
std::visit<ReturnType>(std::move(obj), v);
- assert(Fn::check_call<long &>(CT_NonConst | CT_RValue));
+ assert(Fn::check_call<long&>(CT_NonConst | CT_RValue));
std::visit<ReturnType>(std::move(cobj), v);
- assert(Fn::check_call<long &>(CT_Const | CT_RValue));
+ assert(Fn::check_call<long&>(CT_Const | CT_RValue));
}
{ // test call operator forwarding - multi variant, multi arg
- using V = std::variant<int, long, double>;
- using V2 = std::variant<int *, std::string>;
+ using V = std::variant<int, long, double>;
+ using V2 = std::variant<int*, std::string>;
V v(42l);
V2 v2("hello");
std::visit<int>(obj, v, v2);
- assert((Fn::check_call<long &, std::string &>(CT_NonConst | CT_LValue)));
+ assert((Fn::check_call<long&, std::string&>(CT_NonConst | CT_LValue)));
std::visit<ReturnType>(cobj, v, v2);
- assert((Fn::check_call<long &, std::string &>(CT_Const | CT_LValue)));
+ assert((Fn::check_call<long&, std::string&>(CT_Const | CT_LValue)));
std::visit<ReturnType>(std::move(obj), v, v2);
- assert((Fn::check_call<long &, std::string &>(CT_NonConst | CT_RValue)));
+ assert((Fn::check_call<long&, std::string&>(CT_NonConst | CT_RValue)));
std::visit<ReturnType>(std::move(cobj), v, v2);
- assert((Fn::check_call<long &, std::string &>(CT_Const | CT_RValue)));
+ assert((Fn::check_call<long&, std::string&>(CT_Const | CT_RValue)));
}
{
using V = std::variant<int, long, double, std::string>;
V v1(42l), v2("hello"), v3(101), v4(1.1);
std::visit<ReturnType>(obj, v1, v2, v3, v4);
- assert((Fn::check_call<long &, std::string &, int &, double &>(CT_NonConst | CT_LValue)));
+ assert((Fn::check_call<long&, std::string&, int&, double&>(CT_NonConst | CT_LValue)));
std::visit<ReturnType>(cobj, v1, v2, v3, v4);
- assert((Fn::check_call<long &, std::string &, int &, double &>(CT_Const | CT_LValue)));
+ assert((Fn::check_call<long&, std::string&, int&, double&>(CT_Const | CT_LValue)));
std::visit<ReturnType>(std::move(obj), v1, v2, v3, v4);
- assert((Fn::check_call<long &, std::string &, int &, double &>(CT_NonConst | CT_RValue)));
+ assert((Fn::check_call<long&, std::string&, int&, double&>(CT_NonConst | CT_RValue)));
std::visit<ReturnType>(std::move(cobj), v1, v2, v3, v4);
- assert((Fn::check_call<long &, std::string &, int &, double &>(CT_Const | CT_RValue)));
+ assert((Fn::check_call<long&, std::string&, int&, double&>(CT_Const | CT_RValue)));
}
{
using V = std::variant<int, long, double, int*, std::string>;
V v1(42l), v2("hello"), v3(nullptr), v4(1.1);
std::visit<ReturnType>(obj, v1, v2, v3, v4);
- assert((Fn::check_call<long &, std::string &, int *&, double &>(CT_NonConst | CT_LValue)));
+ assert((Fn::check_call<long&, std::string&, int*&, double&>(CT_NonConst | CT_LValue)));
std::visit<ReturnType>(cobj, v1, v2, v3, v4);
- assert((Fn::check_call<long &, std::string &, int *&, double &>(CT_Const | CT_LValue)));
+ assert((Fn::check_call<long&, std::string&, int*&, double&>(CT_Const | CT_LValue)));
std::visit<ReturnType>(std::move(obj), v1, v2, v3, v4);
- assert((Fn::check_call<long &, std::string &, int *&, double &>(CT_NonConst | CT_RValue)));
+ assert((Fn::check_call<long&, std::string&, int*&, double&>(CT_NonConst | CT_RValue)));
std::visit<ReturnType>(std::move(cobj), v1, v2, v3, v4);
- assert((Fn::check_call<long &, std::string &, int *&, double &>(CT_Const | CT_RValue)));
+ assert((Fn::check_call<long&, std::string&, int*&, double&>(CT_Const | CT_RValue)));
}
}
@@ -109,69 +109,69 @@ void test_argument_forwarding() {
{ // single argument - value type
using V = std::variant<int>;
V v(42);
- const V &cv = v;
+ const V& cv = v;
std::visit<ReturnType>(obj, v);
- assert(Fn::check_call<int &>(Val));
+ assert(Fn::check_call<int&>(Val));
std::visit<ReturnType>(obj, cv);
- assert(Fn::check_call<const int &>(Val));
+ assert(Fn::check_call<const int&>(Val));
std::visit<ReturnType>(obj, std::move(v));
- assert(Fn::check_call<int &&>(Val));
+ assert(Fn::check_call<int&&>(Val));
std::visit<ReturnType>(obj, std::move(cv));
- assert(Fn::check_call<const int &&>(Val));
+ assert(Fn::check_call<const int&&>(Val));
}
#if !defined(TEST_VARIANT_HAS_NO_REFERENCES)
{ // single argument - lvalue reference
- using V = std::variant<int &>;
- int x = 42;
+ using V = std::variant<int&>;
+ int x = 42;
V v(x);
- const V &cv = v;
+ const V& cv = v;
std::visit<ReturnType>(obj, v);
- assert(Fn::check_call<int &>(Val));
+ assert(Fn::check_call<int&>(Val));
std::visit<ReturnType>(obj, cv);
- assert(Fn::check_call<int &>(Val));
+ assert(Fn::check_call<int&>(Val));
std::visit<ReturnType>(obj, std::move(v));
- assert(Fn::check_call<int &>(Val));
+ assert(Fn::check_call<int&>(Val));
std::visit<ReturnType>(obj, std::move(cv));
- assert(Fn::check_call<int &>(Val));
+ assert(Fn::check_call<int&>(Val));
}
{ // single argument - rvalue reference
- using V = std::variant<int &&>;
- int x = 42;
+ using V = std::variant<int&&>;
+ int x = 42;
V v(std::move(x));
- const V &cv = v;
+ const V& cv = v;
std::visit<ReturnType>(obj, v);
- assert(Fn::check_call<int &>(Val));
+ assert(Fn::check_call<int&>(Val));
std::visit<ReturnType>(obj, cv);
- assert(Fn::check_call<int &>(Val));
+ assert(Fn::check_call<int&>(Val));
std::visit<ReturnType>(obj, std::move(v));
- assert(Fn::check_call<int &&>(Val));
+ assert(Fn::check_call<int&&>(Val));
std::visit<ReturnType>(obj, std::move(cv));
- assert(Fn::check_call<int &&>(Val));
+ assert(Fn::check_call<int&&>(Val));
}
#endif
{ // multi argument - multi variant
using V = std::variant<int, std::string, long>;
V v1(42), v2("hello"), v3(43l);
std::visit<ReturnType>(obj, v1, v2, v3);
- assert((Fn::check_call<int &, std::string &, long &>(Val)));
+ assert((Fn::check_call<int&, std::string&, long&>(Val)));
std::visit<ReturnType>(obj, std::as_const(v1), std::as_const(v2), std::move(v3));
- assert((Fn::check_call<const int &, const std::string &, long &&>(Val)));
+ assert((Fn::check_call<const int&, const std::string&, long&&>(Val)));
}
{
using V = std::variant<int, long, double, std::string>;
V v1(42l), v2("hello"), v3(101), v4(1.1);
std::visit<ReturnType>(obj, v1, v2, v3, v4);
- assert((Fn::check_call<long &, std::string &, int &, double &>(Val)));
+ assert((Fn::check_call<long&, std::string&, int&, double&>(Val)));
std::visit<ReturnType>(obj, std::as_const(v1), std::as_const(v2), std::move(v3), std::move(v4));
- assert((Fn::check_call<const long &, const std::string &, int &&, double &&>(Val)));
+ assert((Fn::check_call<const long&, const std::string&, int&&, double&&>(Val)));
}
{
using V = std::variant<int, long, double, int*, std::string>;
V v1(42l), v2("hello"), v3(nullptr), v4(1.1);
std::visit<ReturnType>(obj, v1, v2, v3, v4);
- assert((Fn::check_call<long &, std::string &, int *&, double &>(Val)));
+ assert((Fn::check_call<long&, std::string&, int*&, double&>(Val)));
std::visit<ReturnType>(obj, std::as_const(v1), std::as_const(v2), std::move(v3), std::move(v4));
- assert((Fn::check_call<const long &, const std::string &, int *&&, double &&>(Val)));
+ assert((Fn::check_call<const long&, const std::string&, int*&&, double&&>(Val)));
}
}
@@ -179,7 +179,7 @@ template <typename ReturnType>
void test_return_type() {
using Fn = ForwardingCallObject;
Fn obj{};
- const Fn &cobj = obj;
+ const Fn& cobj = obj;
{ // test call operator forwarding - no variant
static_assert(std::is_same_v<decltype(std::visit<ReturnType>(obj)), ReturnType>);
static_assert(std::is_same_v<decltype(std::visit<ReturnType>(cobj)), ReturnType>);
@@ -203,8 +203,8 @@ void test_return_type() {
static_assert(std::is_same_v<decltype(std::visit<ReturnType>(std::move(cobj), v)), ReturnType>);
}
{ // test call operator forwarding - multi variant, multi arg
- using V = std::variant<int, long, double>;
- using V2 = std::variant<int *, std::string>;
+ using V = std::variant<int, long, double>;
+ using V2 = std::variant<int*, std::string>;
V v(42l);
V2 v2("hello");
static_assert(std::is_same_v<decltype(std::visit<ReturnType>(obj, v, v2)), ReturnType>);
@@ -245,7 +245,7 @@ void test_constexpr_void() {
}
{
using V1 = std::variant<int>;
- using V2 = std::variant<int, char *, long long>;
+ using V2 = std::variant<int, char*, long long>;
using V3 = std::variant<bool, int, int>;
constexpr V1 v1;
constexpr V2 v2(nullptr);
@@ -254,20 +254,20 @@ void test_constexpr_void() {
}
{
using V1 = std::variant<int>;
- using V2 = std::variant<int, char *, long long>;
- using V3 = std::variant<void *, int, int>;
+ using V2 = std::variant<int, char*, long long>;
+ using V3 = std::variant<void*, int, int>;
constexpr V1 v1;
constexpr V2 v2(nullptr);
constexpr V3 v3;
static_assert((std::visit<void>(aobj, v1, v2, v3), 3) == 3, "");
}
{
- using V = std::variant<int, long, double, int *>;
+ using V = std::variant<int, long, double, int*>;
constexpr V v1(42l), v2(101), v3(nullptr), v4(1.1);
static_assert((std::visit<void>(aobj, v1, v2, v3, v4), 4) == 4, "");
}
{
- using V = std::variant<int, long, double, long long, int *>;
+ using V = std::variant<int, long, double, long long, int*>;
constexpr V v1(42l), v2(101), v3(nullptr), v4(1.1);
static_assert((std::visit<void>(aobj, v1, v2, v3, v4), 4) == 4, "");
}
@@ -288,7 +288,7 @@ void test_constexpr_int() {
}
{
using V1 = std::variant<int>;
- using V2 = std::variant<int, char *, long long>;
+ using V2 = std::variant<int, char*, long long>;
using V3 = std::variant<bool, int, int>;
constexpr V1 v1;
constexpr V2 v2(nullptr);
@@ -297,20 +297,20 @@ void test_constexpr_int() {
}
{
using V1 = std::variant<int>;
- using V2 = std::variant<int, char *, long long>;
- using V3 = std::variant<void *, int, int>;
+ using V2 = std::variant<int, char*, long long>;
+ using V3 = std::variant<void*, int, int>;
constexpr V1 v1;
constexpr V2 v2(nullptr);
constexpr V3 v3;
static_assert(std::visit<int>(aobj, v1, v2, v3) == 3, "");
}
{
- using V = std::variant<int, long, double, int *>;
+ using V = std::variant<int, long, double, int*>;
constexpr V v1(42l), v2(101), v3(nullptr), v4(1.1);
static_assert(std::visit<int>(aobj, v1, v2, v3, v4) == 4, "");
}
{
- using V = std::variant<int, long, double, long long, int *>;
+ using V = std::variant<int, long, double, long long, int*>;
constexpr V v1(42l), v2(101), v3(nullptr), v4(1.1);
static_assert(std::visit<int>(aobj, v1, v2, v3, v4) == 4, "");
}
@@ -320,10 +320,10 @@ template <typename ReturnType>
void test_exceptions() {
#ifndef TEST_HAS_NO_EXCEPTIONS
ReturnArity obj{};
- auto test = [&](auto &&... args) {
+ auto test = [&](auto&&... args) {
try {
std::visit<ReturnType>(obj, args...);
- } catch (const std::bad_variant_access &) {
+ } catch (const std::bad_variant_access&) {
return true;
} catch (...) {
}
@@ -336,24 +336,24 @@ void test_exceptions() {
assert(test(v));
}
{
- using V = std::variant<int, MakeEmptyT>;
- using V2 = std::variant<long, std::string, void *>;
+ using V = std::variant<int, MakeEmptyT>;
+ using V2 = std::variant<long, std::string, void*>;
V v;
makeEmpty(v);
V2 v2("hello");
assert(test(v, v2));
}
{
- using V = std::variant<int, MakeEmptyT>;
- using V2 = std::variant<long, std::string, void *>;
+ using V = std::variant<int, MakeEmptyT>;
+ using V2 = std::variant<long, std::string, void*>;
V v;
makeEmpty(v);
V2 v2("hello");
assert(test(v2, v));
}
{
- using V = std::variant<int, MakeEmptyT>;
- using V2 = std::variant<long, std::string, void *, MakeEmptyT>;
+ using V = std::variant<int, MakeEmptyT>;
+ using V2 = std::variant<long, std::string, void*, MakeEmptyT>;
V v;
makeEmpty(v);
V2 v2;
@@ -384,8 +384,7 @@ void test_caller_accepts_nonconst() {
struct A {};
struct Visitor {
auto operator()(A&) {
- if constexpr (!std::is_void_v<ReturnType>)
- {
+ if constexpr (!std::is_void_v<ReturnType>) {
return ReturnType{};
}
}
@@ -426,9 +425,7 @@ void test_derived_from_variant() {
char valueless_by_exception;
};
- struct EvilVariant1 : std::variant<int, long, double>,
- std::tuple<int>,
- EvilVariantBase {
+ struct EvilVariant1 : std::variant<int, long, double>, std::tuple<int>, EvilVariantBase {
using std::variant<int, long, double>::variant;
};
@@ -448,7 +445,10 @@ void test_derived_from_variant() {
// Check that visit unambiguously picks the variant, even if the other base has __impl member.
struct ImplVariantBase {
struct Callable {
- bool operator()() const { assert(false); return false; }
+ bool operator()() const {
+ assert(false);
+ return false;
+ }
};
Callable __impl;
@@ -479,8 +479,7 @@ struct any_visitor {
}
};
-template <typename T, typename = decltype(std::visit<bool>(
- std::declval<any_visitor&>(), std::declval<T>()))>
+template <typename T, typename = decltype(std::visit<bool>(std::declval<any_visitor&>(), std::declval<T>()))>
constexpr bool has_visit(int) {
return true;
}
diff --git a/libcxx/test/std/utilities/variant/variant.visit/visit.robust_against_adl.pass.cpp b/libcxx/test/std/utilities/variant/variant.visit/visit.robust_against_adl.pass.cpp
index 6f17fa3264..125ac20490 100644
--- a/libcxx/test/std/utilities/variant/variant.visit/visit.robust_against_adl.pass.cpp
+++ b/libcxx/test/std/utilities/variant/variant.visit/visit.robust_against_adl.pass.cpp
@@ -17,27 +17,28 @@
#include "test_macros.h"
struct Incomplete;
-template<class T> struct Holder { T t; };
+template <class T>
+struct Holder {
+ T t;
+};
-constexpr bool test(bool do_it)
-{
- if (do_it) {
- std::variant<Holder<Incomplete>*, int> v = nullptr;
- std::visit([](auto){}, v);
- std::visit([](auto) -> Holder<Incomplete>* { return nullptr; }, v);
+constexpr bool test(bool do_it) {
+ if (do_it) {
+ std::variant<Holder<Incomplete>*, int> v = nullptr;
+ std::visit([](auto) {}, v);
+ std::visit([](auto) -> Holder<Incomplete>* { return nullptr; }, v);
#if TEST_STD_VER > 17
- std::visit<void>([](auto){}, v);
- std::visit<void*>([](auto) -> Holder<Incomplete>* { return nullptr; }, v);
+ std::visit<void>([](auto) {}, v);
+ std::visit<void*>([](auto) -> Holder<Incomplete>* { return nullptr; }, v);
#endif
- }
- return true;
+ }
+ return true;
}
-int main(int, char**)
-{
- test(true);
+int main(int, char**) {
+ test(true);
#if TEST_STD_VER > 17
- static_assert(test(true));
+ static_assert(test(true));
#endif
- return 0;
+ return 0;
}
``````````
</details>
https://github.com/llvm/llvm-project/pull/76447
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